Originally, the HEI system was fitted with a four-pin module. By 1978, it had a five-pin unit. Seven and eight-pin modules were more a computer-controlled element that came around in the 1980s.

The HEI Distributor has been a standard in the world of stand-alone electronic ingitions since 1974. We give our HEI Distributor a tune-up in the February 2013 issue of Car Craft Magazine.

Car Craft tales you through the steps of how to convert a Ford or Chrysler ingition to a GM HEI for a high-performance, more-efficient ignition.

We analyze 10 common myths regarding HEI (High Energy Ignitions) distributor system including ones regarding internal coils, billet housings, performance gains, vacuum advance, and plug wires ...